SKF bearings show strong regularity during their use, and the repeatability is very good. Normal high-quality bearings (SKF bearings) have relatively low vibration and noise at the beginning of use, but the frequency spectrum is somewhat scattered, and the amplitude is small, which may be caused by some defects in the manufacturing process, such as surface burrs.

After exercising for a period of time, the vibration and noise maintain a certain level, and the frequency spectrum is very single, with only one or two doubled frequencies. There is rarely a frequency spectrum above three times the power frequency, and the self-aligning ball bearing is in a very stable state, entering a stable working period.

After continuing to run and entering the later stage of use, SKF bearing vibration and noise began to increase, and sometimes abnormal noises appeared, but the increase in vibration changed slowly. At this time, the bearing kurtosis value suddenly reached a certain value. We believe that at this time SKF bearings are manifested as an initial failure.

At this time, it is required to closely monitor the SKF bearing and pay close attention to its changes. After that, the bearing kurtosis value began to drop rapidly and approached the normal value, while the vibration and noise began to increase significantly, and the increase rate began to accelerate. When the vibration exceeded the vibration standard (such as the ISO2372 standard), the bearing kurtosis value also began Rapid increase. When both the vibration standard and the kurtosis value exceed the normal value (available kurtosis relative standard), we believe that the self-aligning ball bearing has entered the late stage of failure production, and the equipment needs to be repaired in time and the SKF bearing is replaced.

SKF bearings show late failure characteristics to serious failures (usually bearing damage such as shaft holding, burns, spalling of the sand frame, raceway, bead wear, etc.). The time is not more than one week. The larger the equipment capacity, the faster the speed. The shorter the interval time. Therefore, in the actual fault diagnosis of self-aligning ball bearings, once the late fault features are found, the bearing should be determined decisively and repaired as soon as possible.

The use factor mainly refers to whether the installation adjustment, use and maintenance, maintenance and repair meet the technical requirements. According to the technical requirements of SKF bearing installation, use, maintenance, and maintenance, monitor and inspect the load, speed, working temperature, vibration, noise and lubrication conditions of SKF bearings in operation. If abnormalities are found, immediately find the cause and make adjustments. Bring it back to normal.

First of all, the spindle bearing in the spindle should be fully lubricated during operation, and lubrication should be added regularly according to the actual conditions of use, and the oil should not be cut off for a long time. Therefore, for user companies, better and more suitable spindle lubricants should be selected. The new special spindle oil can significantly improve the lubrication performance, extend the oil change interval, extend the service life of the spindle and the self-aligning ball bearing, and also has better anti-rust and anti-corrosion properties.

Secondly, the use temperature of the bearing with reinforced nylon material cage should be lower than 120℃, and it is strictly forbidden to clean it with oil.

In addition, pay attention to methods when the spindle is maintained and cleaned to prevent damage and scratches on the surface of the roller. To remove the residues on the SKF bearing parts as much as possible, it is better to use washing and suction methods to clean the remaining oil inside the spindle feet. Attention should be paid to avoid the use of dumping, which will cause cleaning garbage to accumulate and remain in the bearing part, which may cause problems such as noise and wear failure of the self-aligning ball bearing.